B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
B60T 17/22 (2006.01) G01L 27/00 (2006.01)
Patent
CA 2090309
A transducer health and offset calibration processing arrangement for a multiple axle railway vehicle including a brake cylinder transducer correction function circuit coupled to a stuck/dragging brake signal terminal, a brake command signal terminal, and a power/brake trainline signal terminal. A zero speed latch circuit and a transducer circuit interface health check circuit connected to a zero speed signal terminal. A first three-input AND gate connected to the zero speed signal terminal, a snowbrake trainline signal terminal, and a Servotrol output signal terminal. A second three-input AND gate coupled to the output of the first three-input AND gate and a highest axle speed signal terminal. A minimum axle rate discriminator circuit connected to each of plurality of axle rate signal terminals of the multiple axles of the railway vehicle. A brake cylinder pressure circuit check and a brake cylinder pressure signal generator coupled to a truck brake cylinder pressure signal terminal. The brake cylinder pressure signal generator, a transducer circuit interface health check circuit, and the transducer cylinder transducer correction function circuit coupled to a timer input signal terminal. A transducer offset initialization function circuit connected to a cold start input terminal. The minimum axle rate determination circuit having an output connected to the second three-input AND gate which has an output connected to a check and recalibrate enable function circuit. The zero speed latch circuit having an output connected to the check and recalibrate enable function circuit which has an output coupled to the zero speed latch circuit, a transducer offset calculation function circuit, the transducer offset initialization function circuit, and a transducer fault code generator. The transducer fault code generator has an output connected to the transducer circuit interface health check circuit which has an output connected to the brake cylinder pressure circuit check, the brake cylinder pressure signal generator, the transducer fault code generator, and a transducer circuit fault determination matrix. The transducer circuit fault determination matrix having a first output connected to an event interface file, a second output connected to a seven segment display, a third input connected to a RAM fault log, the transducer offset initialization function circuit having an output connected to a previous offset storage and to the brake cylinder transducer correction function circuit which has an output connected to a corrected brake cylinder pressure device. -50-
Drake John W.
Pcsolar David J.
Wood James A.
Macrae & Co.
Westinghouse Air Brake Company
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